package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author XPQ
 * @function
 * @since 2024-05-30
 */
@Component
public class RedisWorker {

    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640995200L;

    /**
     * 序列号的位数
     */
    private static final long COUNT_BITS = 32L;

    private StringRedisTemplate stringRedisTemplate;

    public RedisWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        // 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long timestamp = now.toEpochSecond(ZoneOffset.UTC);

        // 生成序列号
        // 获取档期日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        // 拼接并返回
        return timestamp << COUNT_BITS | count;
    }

}
